Index: firmware/App/Services/TxParams.h
===================================================================
diff -u -rda59fa4a98dbc11c37677e92a66aa940d251678f -rd387dc3cd21e6f1fb7e161032f30eb49a9c1b48e
--- firmware/App/Services/TxParams.h	(.../TxParams.h)	(revision da59fa4a98dbc11c37677e92a66aa940d251678f)
+++ firmware/App/Services/TxParams.h	(.../TxParams.h)	(revision d387dc3cd21e6f1fb7e161032f30eb49a9c1b48e)
@@ -104,17 +104,54 @@
     F32 uFVolume_L;                                         ///< Current ultrafiltration volume (in L).
 } CURRENT_TREATMENT_PARAMS_DATA_PAYLOAD_T;
 
-/// Payload record structure for treatment parameter range broadcast messages.
+#pragma pack(push, 1)
+
+/// Payload record structure for requesting an isolated UF duration change.
 typedef struct
 {
-    U32 minTreatmentTime;                                               ///< Minimum treatment duration (in minutes)
-    U32 maxTreatmentTime;                                               ///< Maximum treatment duration (in minutes)
-    F32 minUFVolume;                                                    ///< Minimum ultrafiltration volume (in mL)
-    F32 maxUFVolume;                                                    ///< Maximum ultrafiltration volume (in mL)
-    U32 minDialRate;                                                    ///< Minimum dialysate flow rate (in mL/min)
-    U32 maxDialRate;                                                    ///< Maximum dialysate flow rate (in mL/min)
-} TREATMENT_PARAM_RANGE_BROADCAST_PAYLOAD_T;
+    U32 mDuration;                                              ///< Requested isolated UF duration in minutes.
+} ISOLATED_UF_DURATION_CHANGE_REQUEST_PAYLOAD_T;
 
+/// Payload record structure for requesting an isolated UF volume goal change.
+typedef struct
+{
+    U32 mDuration;                                              ///< Requested isolated UF duration in minutes.
+    U32 mVolume;                                                ///< Requested isolated UF volume goal in mL.
+} ISOLATED_UF_VOLUME_GOAL_CHANGE_REQUEST_PAYLOAD_T;
+
+/// Payload record structure for confirming an isolated UF settings change.
+typedef struct
+{
+    U32 mConfirmed;                                             ///< TRUE if user confirms the staged isolated UF settings.
+} ISOLATED_UF_CONFIRM_REQUEST_PAYLOAD_T;
+
+/// Payload record structure for isolated UF duration change responses.
+typedef struct
+{
+    U32 mAccepted;                                              ///< Accepted/Rejected.
+    U32 mReason;                                                ///< Rejection reason if not accepted.
+    U32 mVolumeMax;                                             ///< Maximum isolated UF volume in mL for the requested duration.
+} ISOLATED_UF_DURATION_CHANGE_RESPONSE_PAYLOAD_T;
+
+/// Payload record structure for isolated UF volume goal change responses.
+typedef struct
+{
+    U32 mAccepted;                                              ///< Accepted/Rejected.
+    U32 mReason;                                                ///< Rejection reason if not accepted.
+    U32 mVolume;                                                ///< Isolated UF volume goal in mL.
+    U32 mDuration;                                              ///< Isolated UF duration in minutes.
+    U32 mRate;                                                  ///< Isolated UF rate in mL/min.
+} ISOLATED_UF_VOLUME_GOAL_CHANGE_RESPONSE_PAYLOAD_T;
+
+/// Payload record structure for isolated UF confirmation responses.
+typedef struct
+{
+    U32 mAccepted;                                              ///< Accepted/Rejected.
+    U32 mReason;                                                ///< Rejection reason if not accepted.
+} ISOLATED_UF_CONFIRM_RESPONSE_PAYLOAD_T;
+
+#pragma pack(pop)
+
 // ********** public function prototypes ****************
 
 BOOL setTreatmentParameterU32( TREATMENT_PARAM_T param, U32 value );                // Set a specified unsigned integer treatment parameter value
@@ -124,6 +161,10 @@
 
 BOOL validateAndSetTreatmentParameters( MESSAGE_T *message );                       // User provided treatment params to be set and validated
 //BOOL validateAndSetUFVolume( MESSAGE_T *message );                                  // User provided ultrafiltration volume to be set and validated
+F32  calculateIsolatedUFRateMlMin( U32 durationMin, F32 volumeGoalMl );             // Calculate isolated UF rate (mL/min) from duration and volume goal
+BOOL handleIsolatedUFDurationChangeRequest( MESSAGE_T *message );                   // User requested isolated UF duration change
+BOOL handleIsolatedUFVolumeGoalChangeRequest( MESSAGE_T *message );                 // User requested isolated UF volume goal change
+BOOL handleIsolatedUFConfirmRequest( MESSAGE_T *message );                          // User confirmed/rejected isolated UF settings change
 
 void resetTreatmentParameters( void );                                              // Reset all parameters to defaults
 //BOOL signalUserConfirmationOfTreatmentParameters( MESSAGE_T *message );             // Process UI confirm/reject Treatment  parameters